Synovioma
Synovial Sarcoma

• Middle-aged and older adults

• Most frequent presentation: painful swelling of the knee

• Predisposition for lower extremity

• It is a malignancy

• Can occur at any age

• Usually third and fourth decades

• Usually are extra-articular

• X-ray

• Soft tissue mass near articular surface

• Frequently, spherical and lobulated in shape

• 20-30% calcify

• About 1/3 have adjacent erosion of bone

• Look for erosions on both sides of a joint

• Osteoporosis is common secondary to disuse

• DDX from pigmented villonodular synovitis where there is rarely osteoporosis

Frontal radiograph of the foot demonstrates a heavily calcified
 lesion which is arising from the dorsum of the foot between the 2nd and 3rd metatarsals.

• Can metastasize to lungs

• Mets to lungs almost never calcify

• Mets to bone itself very rare

• Prognosis is poor

• Benign variety occurs in the joint capsule around knee

• DDX:

• Tumoral calcinosis

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